Key facts
- Brand
- Dallas
- Model
- DS18B20
- Category
- Temperature sensors
- Industry
- Electronics
- Documents
- 2
- Languages
- ZH
- Last added
- 2026-09-29
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Dallas DS18B20 Temperature Sensor Manual
This manual describes the DS18B20 digital temperature sensor, a 3‑pin TO‑92 device produced by Dallas. It outlines the sensor's temperature range of –55 °C to +125 °C, supply voltage of 3 V‑5.5 V, programmable resolution of 9‑12 bits, and its ability to be paralleled on a single bus.
The document details the one‑wire communication protocol, including ROM and function commands, timing diagrams for read/write operations, and example assembly code for initializing, reading, and configuring the sensor. It also includes programming notes for setting alarm thresholds and resolution. This manual is written in Chinese.
Dallas DS18B20 specifications
| Supply Voltage | 3 V – 5 V |
|---|---|
| Resolution | 9 – 12 bits |
| Temperature Range | -55 °C – 125 °C |
| Accuracy | ±0.5 °C (‑10 °C – 85 °C) |
| Conversion Time (9‑bit) | 93.75 ms |
| Conversion Time (11‑bit) | 375 ms |
| Conversion Time (12‑bit) | 750 ms |
| Package Options | TO‑92, SOIC, CSP |
All Dallas DS18B20 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What supply voltage does the DS18B20 require?
The sensor operates from 3 V to 5 V.
How many bits of temperature resolution can be configured?
The DS18B20 can be configured for 9, 10, 11, or 12‑bit resolution.
What temperature range does the DS18B20 support?
It operates from –55 °C up to +125 °C.
How many DS18B20 sensors can be connected on a single bus?
Multiple DS18B20 devices can be paralleled on a 3‑wire (VDD, DQ, GND) or 2‑wire (DQ, GND) bus.